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I recently acquired a L 110 with a sd 220 when I try cranking it over it locks up, I can free it up by turning backwards then it'll sometimes crank for quite awhile or sometimes only half a turn. I can not turn the right way when it's locked but turns backwards with not much resistance. The valves all seem to be good. Any ideas on what could be the issue?

(quoted from post at 05:21:35 06/14/16) I recently acquired a L 110 with a sd 220 when I try cranking it over it locks up, I can free it up by turning backwards then it'll sometimes crank for quite awhile or sometimes only half a turn. I can not turn the right way when it's locked but turns backwards with not much resistance. The valves all seem to be good. Any ideas on what could be the issue?

I had that recently on a 51 ford flathead v8. Turns out the clutch pressure plate had come apart and was jamming against the starter ben dix and just jamming everthing up. Pull the starter when it is stuck and see what you find. good luck